This PAS-C01 practice question tests your understanding of technology. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
"Error: 'SAP' is not authorized to perform: ec2:DescribeInstances on resource: arn:aws:ec2:us-east-1:123456789012:instance/*"
An SAP administrator is trying to set up an AWS CLI script that queries EC2 instance metadata. The script runs on an EC2 instance with an IAM role attached. The IAM role has the following policy:
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance does not have an IAM instance profile associated, or the profile name does not match the role name.
Option D is correct because the error message shows the principal is 'SAP', which suggests the instance profile name is 'SAP', but the policy is attached to the role, and the instance profile must have the same name as the role or be correctly associated. Option A is wrong because the policy allows all resources. Option B is wrong because the error is about authorization, not region mismatch. Option C is wrong because the error shows the action is ec2:DescribeInstances.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The instance does not have an IAM instance profile associated, or the profile name does not match the role name.
Why this is correct
If the instance profile is not attached or is misconfigured, the role's permissions are not applied, causing the authorization error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The IAM policy does not specify a resource ARN.
Why it's wrong here
The policy uses "Resource": "*", which is valid for DescribeInstances.
✗
The IAM role does not have the ec2:DescribeInstances action allowed.
Why it's wrong here
The policy allows the action, but the error persists.
✗
The AWS CLI is not configured with the correct region.
Why it's wrong here
Region mismatch would cause a different error, not an authorization error.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PAS-C01 questions on access control and AAA configuration.
Technology — This question tests Technology — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The instance does not have an IAM instance profile associated, or the profile name does not match the role name. — Option D is correct because the error message shows the principal is 'SAP', which suggests the instance profile name is 'SAP', but the policy is attached to the role, and the instance profile must have the same name as the role or be correctly associated. Option A is wrong because the policy allows all resources. Option B is wrong because the error is about authorization, not region mismatch. Option C is wrong because the error shows the action is ec2:DescribeInstances.
What should I do if I get this PAS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PAS-C01 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Authentication checks who the user is.
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